diff --git a/README.md b/README.md
index 02c594a..39b33e6 100644
--- a/README.md
+++ b/README.md
@@ -14,8 +14,7 @@ It ultilizes vim's native matchfuzzypos function and popup window feature.
 
 - vim > 9.0
     - The maintained version is written in vim9, but it also has a vim8 branch for older vim.
-- any of grep, ag or rg
-- find or fd
+- any of grep, ag or rg for FuzzyGrep command
 - [vim-devicons](https://github.com/ryanoasis/vim-devicons) (optional)
 
 ## Install
@@ -106,6 +105,13 @@ let g:enable_fuzzyy_keymaps = 0
 " Default to 0
 let g:files_respect_gitignore = 1
 
+" FuzzyFiles will exclude the files/directory in these two lists
+" only work when g:files_respect_gitignore = 0
+" The following is the default
+let g:fuzzyy_files_ignore_file = ['*.beam', '*.so', '*.exe', '*.dll', '*.dump',
+    '*.core', '*.swn', '*.swp']
+var g:fuzzyy_files_ignore_dir = ['.git', '.hg', '.svn', '.rebar', '.eunit']
+
 " Change navigation keymaps
 " The following is the default
 let g:fuzzyy_keymaps = {
@@ -132,9 +138,9 @@ let g:fuzzyy_menu_matched_hl = 'cursearch'
 " Default to 1 if vim-devicons is installed, 0 otherwise
 let g:fuzzyy_devicons = 1
 
-" Enable dropdown theme
+" Whether enable dropdown theme
 " Default to 0
-let g:fuzzyy_dropdown = 1
+let g:fuzzyy_dropdown = 0
 
 " Enable FuzzyMRUFiles command.
 " If enabled, the MRU list will be recorded into ~/.vim_mru_files in Unix
diff --git a/autoload/fuzzy/files.vim b/autoload/fuzzy/files.vim
index 7bc9e04..9c1d76d 100644
--- a/autoload/fuzzy/files.vim
+++ b/autoload/fuzzy/files.vim
@@ -2,6 +2,7 @@ vim9script
 
 import autoload 'utils/selector.vim'
 import autoload 'utils/devicons.vim'
+import autoload 'utils/cmdbuilder.vim'
 
 var last_result_len: number
 var cur_pattern: string
@@ -14,56 +15,9 @@ var jid: job
 var menu_wid: number
 var files_update_tid: number
 var cache: dict<any>
-var cmdstr: string
 var matched_hl_offset = 0
 var devicon_char_width = devicons.GetDeviconCharWidth()
 
-var commands: dict<any>
-var has_git = executable('git') ? v:true : v:false
-
-def InsideGitRepo(): bool
-    if has_git
-        return stridx(system('git rev-parse --is-inside-work-tree'), 'true') == 0
-    else
-        echom 'fuzzyy: git is not installed'
-        return v:false
-    endif
-enddef
-
-if executable('fd')
-    commands = {
-        'default': 'fd --type f -H -I -E .git',
-        'gitignore': 'fd --type f -H -E .git',
-    }
-else
-    if has('win32')
-        commands = {
-            'default': 'powershell -command "gci . -r -n -File"',
-        }
-    else
-        commands = {
-            'default': 'find . -type f -not -path "*/.git/*"',
-        }
-    endif
-    # TODO bugs
-    if has_git && InsideGitRepo()
-        commands.gitignore = 'git ls-files --cached --other --exclude-standard --full-name .'
-    else
-        commands.gitignore = v:null
-    endif
-endif
-
-if has_git
-    commands.only_git_files = 'git ls-files'
-endif
-
-def GetOrDefault(name: string, default: any): any
-    if exists(name)
-        return eval(name)
-    endif
-    return default
-enddef
-
 var enable_devicons = exists('g:fuzzyy_devicons') && exists('g:WebDevIconsGetFileTypeSymbol') ?
     g:fuzzyy_devicons : exists('g:WebDevIconsGetFileTypeSymbol')
 if enable_devicons
@@ -71,26 +25,7 @@ if enable_devicons
     matched_hl_offset = devicons.GetDeviconWidth() + 1
 endif
 
-# options
-var respect_gitignore = GetOrDefault('g:files_respect_gitignore', 0)
-var only_git_files = GetOrDefault('g:files_only_git_files', 0)
-
-def InitConfig()
-    cmdstr = ''
-    if only_git_files
-        && commands.only_git_files != v:null
-        && InsideGitRepo()
-        cmdstr = commands.only_git_files
-    elseif respect_gitignore
-        && commands.gitignore != v:null
-        && InsideGitRepo()
-        cmdstr = commands.gitignore
-    else
-        cmdstr = commands.default
-    endif
-enddef
-
-InitConfig()
+var cmdstr = cmdbuilder.Build()
 
 def ProcessResult(list_raw: list<string>, ...args: list<any>): list<string>
     var limit = -1
@@ -204,7 +139,6 @@ def FilesJobStart(path: string, cmd: string)
 enddef
 
 def ErrCb(channel: channel, msg: string)
-    # echom ['err']
 enddef
 
 def ExitCb(j: job, status: number)
@@ -286,3 +220,4 @@ export def Start(windows: dict<any>, ...args: list<any>)
     files_update_tid = timer_start(400, function('FilesUpdateMenu'), {'repeat': -1})
     # Profiling()
 enddef
+
diff --git a/autoload/utils/cmdbuilder.vim b/autoload/utils/cmdbuilder.vim
new file mode 100644
index 0000000..d0274ce
--- /dev/null
+++ b/autoload/utils/cmdbuilder.vim
@@ -0,0 +1,145 @@
+vim9script
+
+var file_ignore_default = ['*.beam', '*.so', '*.exe', '*.dll', '*.dump',
+    '*.core', '*.swn', '*.swp']
+var dir_ignore_default = ['.git', '.hg', '.svn', '.rebar', '.eunit']
+
+# OPTIONS
+var respect_gitignore = exists('g:files_respect_gitignore') ?
+    g:files_respect_gitignore : 0
+var only_git_files = exists('g:files_only_git_files') ?
+    g:files_only_git_files : 0
+var file_ignore = exists('g:fuzzyy_files_ignore_file')
+    && type(g:fuzzyy_files_ignore_file) == v:t_list ?
+    g:fuzzyy_files_ignore_file : file_ignore_default
+var dir_ignore = exists('g:fuzzyy_files_ignore_dir')
+    && type(g:fuzzyy_files_ignore_dir) == v:t_list ?
+    g:fuzzyy_files_ignore_dir : dir_ignore_default
+
+var has_git = executable('git') ? v:true : v:false
+
+def InsideGitRepo(): bool
+    if has_git
+        return stridx(system('git rev-parse --is-inside-work-tree'), 'true') == 0
+    else
+        echom 'fuzzyy: git is not installed'
+        return v:false
+    endif
+enddef
+
+export def Build_fd(): string
+    if respect_gitignore
+        return 'fd --type f -H -E .git'
+    endif
+    var dir_list_parsed = reduce(dir_ignore,
+        (acc, dir) => acc .. "-E " .. dir .. " ", "")
+
+    var file_list_parsed = reduce(file_ignore,
+        (acc, file) => acc .. "-E " .. file .. " ", "")
+
+    var result = "fd --type f -H -I " .. dir_list_parsed .. file_list_parsed
+
+    return result
+enddef
+
+export def Build_find(): string
+    var file_list_parsed = reduce(file_ignore,
+        (acc, file) => acc .. "-not -name " .. file .. " ", "")
+
+    var ParseDir = (dir): string => "*/" .. dir .. "/*"
+    var dir_list_parsed = ""
+    if len(dir_ignore) > 0
+        dir_list_parsed = reduce(dir_ignore, (acc, dir) => acc .. "-not -path " .. ParseDir(dir) .. " ", " ")
+    endif
+    var result = "find . " .. dir_list_parsed
+    if len(file_ignore) > 0
+        result ..= reduce(file_ignore, (acc, file) => acc .. "-not -name " .. file .. " ", " ")
+    endif
+    result ..= "-type f -print "
+
+    return result
+enddef
+
+# GCI doc isn't clear. Get-ChildItem -Recurse -Exclude only matches exclusion
+# on the leaf, not the parent path.
+#
+# Link:
+# https://stackoverflow.com/questions/15294836/how-can-i-exclude-multiple-folders-using-get-childitem-exclude#:~:text=The%20documentation%20isn%27t%20clear%20on%20this%2C%20but%20Get%2DChildItem%20%2DRecurse%20%2DExclude%20only%20matches%20exclusion%20on%20the%20leaf%20(Split%2DPath%20%24_.FullName%20%2DLeaf)%2C%20not%20the%20parent%20path%20(Split%2DPath%20%24_.FullName%20%2DParent).
+#
+# That's why module builds GCI cmd and piping it into Where-filter
+export def Build_gci(): string
+    var build_dir_filter = reduce(dir_ignore, (acc, dir) => acc .. "$_ -notlike '*\\"
+        .. dir ..  "\\*' -and $_ -notlike '" .. dir .. "\\*'"
+        .. " -and ", "")
+            -> trim(" -and ", 2)
+
+    var build_file_filter = reduce(file_ignore, (acc, file) => acc
+        .. "$_ -notlike '" .. file .. "' -and ", "")
+            -> trim(" -and ", 2)
+
+    var build_filter = "| Where-Object { "
+    if len(dir_ignore) > 0
+        build_filter ..= build_dir_filter
+    endif
+    if len(dir_ignore) > 0 && len(file_ignore) > 0
+        build_filter ..= " -and "
+    endif
+    if len(file_ignore) > 0
+        build_filter ..= build_file_filter
+    endif
+    build_filter ..= "} "
+
+    var cmd = "Get-ChildItem . -Name -Force -File -Recurse "
+    if len(dir_ignore) > 0 || len(file_ignore) > 0
+        cmd ..= build_filter
+    endif
+
+    return "powershell -command " .. '"' .. cmd .. '"'
+enddef
+
+export def Build_git_ls_files(): string
+enddef
+
+def RespectGitignore(): string
+    var cmdstr = ''
+    if executable('fd')
+        cmdstr = Build_fd()
+    elseif has_git && InsideGitRepo()
+        cmdstr = 'git ls-files --cached --other --exclude-standard --full-name .'
+    endif
+    return cmdstr
+enddef
+
+def OnlyGitFile(): string
+    var cmdstr = ''
+    if has_git && InsideGitRepo()
+        cmdstr = 'git ls-files'
+    endif
+    return cmdstr
+enddef
+
+export def Build(): string
+    var cmdstr = ''
+    if only_git_files
+        cmdstr = OnlyGitFile()
+        if cmdstr != ''
+            return cmdstr
+        endif
+    endif
+    if respect_gitignore
+        cmdstr = RespectGitignore()
+        if cmdstr != ''
+            return cmdstr
+        endif
+    endif
+    if executable('fd') #fd is cross-platform
+            cmdstr = Build_fd()
+    else
+        if has('win32')
+            cmdstr = Build_gci()
+        else
+            cmdstr = Build_find()
+        endif
+    endif
+    return cmdstr
+enddef